COURSE_NOT_FOUND = "没有找到课程"
LESSON_CANNOT_BE_RESET = "课程不能重置"
LESSON_NOT_FOUND = "没有找到课程"
LESSON_NOT_FOUND_IN_COURSE = "没有找到课程"
COURSE_NOT_PURCHASED = "课程未购买,请先购买课程"
